A) \[100\,m{{s}^{-2}}\]
B) \[3m{{s}^{-2}}\]
C) \[10m{{s}^{-2}}\]
D) \[30m{{s}^{-2}}\]
Correct Answer: B
Solution :
\[a=\frac{{{m}_{2}}}{{{m}_{1}}+{{m}_{2}}}g=\frac{3}{7+3}10=3\,m/{{s}^{2}}\]
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